How to Update Firmware(Unroot) & Install Custom ROM on Rooted OnePlus 5T!
In this tutorial I show you how to update your firmware(OxygenOS) to latest and install custom ROM on a rooted OnePlus 5T. Why do this? Well, a lot of custom ROMs like Havoc ROM I am installing here does require you to have installed the latest factory firmware(OxygenOS) at least once before you can even install the ROM. This is case with most newer custom ROMs.